Polycystic ovary syndrome is a common endocrine disorder characterized by hyperandrogenemia and menstrual disorders. Patients not only have a high incidence of insulin resistance and metabolic syndrome, but also a high incidence of sleep disorders, especially obstructive sleep apnea. Obesity, hyperandrogenemia, insulin resistance,and other factors are responsible for the high prevalence of sleep apnea in women with polycystic ovary syndrome.

As one of the serious complications of diabetes, diabetic retinopathy( DR) has become a main eye disease which causes blindness. The occurrence and development of DR is related to many factors. The pathogenesis is complicated, and the mechanism has not been clear. Early data suggest that the occurrence and development of DR has relations with many factors such as blood sugar level, diabetes duration and the environment. Among the factors, mitochondrial dysfunction and oxidative stress is the important mechanisms of DR and has become research focus in recent years. Consequences of mitochondrial dysfunction within cells include elevation of the rate of reactive oxygen species( ROS) production due to damage of electron transport chain proteins, mitochondrial DNA ( mtDNA ) damage, and loss of metabolic capacity. Clear understanding on the mechanism of mitochondrial functional change under high sugar level and oxidative stress response in the occurrence and development of DR is of great significance on prevention and cure of DR. ln this article, the development of mitochondrial metabolism and oxidative stress of DR is reviewed.

Objective By observing the changes in NGF and its receptor P75 in liver of CCl4-induced toxic rats and to evaluate the role of NGF in the mechanism of hepatic fibrosis.Methods The expressions of NGF mRNA and its receptor P75 were detecteded by both hemi-quantitative RT-PCR and Western blot analysis.Results The expressions of NGF mRNA and its receptor P75 in liver of CCl4-induced toxic rats at 24th hour group were higher than that in control group(P

Objective:To study the effect of ischemic postconditioning(I-postC)on the lung injury following ischemia-reperfusion(I/R)of skeletal muscle in the hind limbs of rats.Methods:The rat model of hind limbs I/R injury was established by subrenal abdominal aorta cross-clamping for 4 hours.Forty-eight rats were divided into 3 groups:I/R group,IPC and I-postC group.Each group received 4 hours of ischemia and then 12 or 24 hours of reperfusion respectively.The tissue morphology,wet-to-dry weight(W/D)ratio,malondialdehyde(MDA)and myeloperoxidase(MPO) of lung tissue were compared.The expression of ICAM-1 mRNA in lung was also studied by RT-PCR or in situ hybridization.The protein product was detected by Western blot.Results:In IPC and I-postC groups,all parameters decreased significantly compared with I/R ischemia group(P

Objective To study the effect of different fraction interval with same total radiation dose on tumor growth delay and survival in C57BL mice implanted with lewis lung cancer,and to determine whether prolonged fraction interval will decrease the tumor response to radiation. Methods Forty-eight mice were implanted with lewis lung cancer in the back legs.When the diameter of transplanted tumor reached 0.8 to 1 cm,the mice were randomized into 6 groups:normal control group,single fraction of 18 Gy group,18 Gy in 2 fractions of 9 Gy at 30 min interval group,18 Gy in 7 fractions of 2.57 Gy at 5 min inter val group,18 Gy in 2 fractions of 9 Gy at 60 min interval group and 18 Gy in 7 fractions of 2.57 Gy at 10 rain interval group.The maximal and minimal diameters of the tumor were measured and record every other day to study the tumor growth tendency,the tumor growth delay and the mice survival time. Results The tumor growth delay of groups at prolonged fraction interval was shorter than the group with single fraction of 18 Gy (P < 0.05).The tumor growth delay of groups at fraction interval of 30 rain was longer than that of groups at interval of 60 rain (P < 0.05).There was no significant difference of the tumor growth delay be tween the groups with same delivery time (P >0.05).The mice survival time of the groups with prolonged fraction interval was shortened when omparing to the group with single fraction of 18 Gy.While the difference was not significant between the groups at fraction interval of 30 min and 60 min. Conclusions The pro longed fraction interval but same total radiation dose shortens the tumor growth delay and survival time in the mice implanted with Lewis lung cancer.The longer fraction interval impairs the tumor control more signifi candy.However the difference of the effect on mice survival time is not significant between the groups at fraction interval of 30 min and 60 min.

Objective To determine effects of activating protein kinase C (PKC) on ventricular action potential duration restitution (APDR) and Burst stimulus induced arrhythmia in Langendorff-perfused rabbit hearts.Methods Male rabbits were equally divided into three groups randomly: control group (Tyrode's solution perfusion),PKC agonist phorbol-12-myristate-13- acetate (PMA,100 nmol/L) group and PKC inhibitor bisindolylmaleimide (BIM,500 nmol/L) group.Thirty minutes after perfusion,the monophasic action potential (MAP) and effective refractory period (ERP) were determined in right basal ventricle (RB),right apex ( RA ),left basal ventricle (LB) and left apex (LA) of all the animals,and APDR curve was drawn.Burst stimulus method was used to induce ventricular arrhythmia in perfused rabbit hearts; Real-time PCR was used to detect the mRNA expression of PKC in four different areas of ventricle.Results Compared with the control group,the ERP,90％ of monophasic action potential duration ( MAPD90 ) and ERP/MAPD90 were significantly shortened ( all P ＜ 0.01 ),the max slopes ( Smax ) of APDR curve were significantly steeper (RB:1.22 ±0.23 vs.0.65 ± 0.19 ; RA:2.99 ± 0.29 vs.1.02 ± 0.18 ;LB:1.84 ±0.21 vs.0.85 ±0.12; LA:4.02 ±0.32 vs.1.12 ±0.23,all P ＜0.01 ) and the incidences of ventricular arrhythmia were significantly increased in the PMA group.All parameters were similar between the BIM group and the control group (all P ＞ 0.05).Conclusion Activating PKC could enhance the max slopes of APDR curve at various ventricular areas and subsequently increase arrhythmia susceptibility in Langendorff-perfused rabbit hearts.

The deubiquitinating enzyme ubiquitin specific peptidase 15 (USP15) is regarded as a regulator of TGFβ signaling pathway. This process depends on Smad7, the inhibitory factor of the TGFβ signal, and type I TGFβ receptor (TβR-I), one of the receptors of TGFβ. The expression level of USP15 seems to play vital roles in the pathogenesis of many neoplasms, but so far there has been no report about USP15 in psoriasis. In this study, immunohistochemical staining of USP15, TβR-I and Smad7 was performed in 30 paraffin-embedded psoriasis specimens and 10 normal specimens to investigate the expression of USP15, TβR-I and Smad7 in psoriasis and to explore the relevance among them. And USP15 small interfering RNA (USP15 siRNA) was used to transfect Hacat cells to detect the mRNA expression of TβR-I and Smad7. Of 30 cases of psoriasis in active stage, 28, 24 and 26 cases were positive for USP15, TβR-I and Smad7 staining, respectively. The positive rates of USP15 and Smad7 were significantly higher in psoriasis specimens than in normal skin specimens (44.1%±26.0% vs. 6.1%±6.6%, 47.2%±27.1% vs. 6.6%±7.1%), and positive rate of TβR-I (20.3%±22.2%) in psoriasis was lower than that in normal skin specimens (46.7%±18.2%). There was a significant positive correlation between USP15 and Smad7 expression, and significant negative correlations between USP15 and TβR-expression, an I d between TβR- and Smad7 expression I in psoriasis. After transfection of USP15 siRNA in Hacat cells, the expression of TβR-mRNA was up I -regulated and that of Smad7 was down-regulated. It is concluded that USP15 may play a role in the pathogenesis of psoriasis through regulating the TβR-I/Smad7 pathway and there may be other cell signaling pathways interacting with USP15 to take part in the development of psoriasis.

Objective To study the mechanism of unscheduled Cyclin B1 expression at G_1 phase which is usually at G_2/M phase.Methods Human peripheral blood lymphocytes(PBL) from healthy volunteers were firstly activated by PHA and then went into cell cycle.The cells were collected at 0,36,48 and 60 h after activation and divided into two parts:one for Cyclins/DNA muhiparameter assay,and another for Post-sorting Western blot.Results After activation by PHA,Cyclin B1 and CDK1 of lymphocytes were expressed at G_1 phase.Conclusion Unscheduled Cyclin B1/CDKl probably contributes to lymphocytes in vivo into cell cycle.

Objective To analyze the outcomes of radiotherapy for 74 patients with intracranial ger-minoma. Methods Between 1990 and 2007,74 patients with intracranial germinoma(9 pathologically diag-nosed and 65 clinically diagnosed) were treated with radiotherapy in our hospital. The median age at diagno-sis was 15 (range 5-45) years. Radiation treatment fields varied among patients, including craniospinal irra-diation(CSI), whole brain irradiation, whole ventricular irradiation with primary tumor boost, and involved-field irradiation only to the primary tumor plus margin. The dose was 38.5 -50.0 Gy to the tumor,18-25 Gy to the whole brain/ventricular,and 21-25 Gy to the whole spinal cord in fractions of 1.6-2.0 Gy per day,5 fractions per week. Results The median follow-up time was 80(range 12-168) months and the fol-low-up rate was 97%. Fourteen patients had been followed up for over 10 years. The 1-,5- and 10-year o-verall survival rates were 99% ,96% and 93%. The corresponding disease free survival rates were 97%, 90% and 83%, respectively. Relapses occurred in 9 patients. For the 6 patients with in-field relapse, the dose to the tumor was 38.5-40.0 Gy in 3 patients, 41-45 Gy in 2 and 46-50 Gy in 1. Relapse in the spinal cord was found in 3 patients and none of them received spinal irradiation. Twenty-one patients re-quired hormonal replacement therapy because of radiation induced hypofunction of prehypophysis. Conclu-sions Radiotherapy alone is a curative treatment for intracranial germinoma. The proper dose should be de-termined by tumor numbers and the examination of cerebrospinal fluid.

Objective To investigate the feasibility of setting mAs in liver enhanced CT scan according to plain scan noise with fixed mA CT scanner,in order to reduce the radiation dose.Methods One hundred continuous patients underwent liver enhanced CT scan (group A) prospectively.Two hundred and fifty mAs was used in plain and enhanced CT scans.Noises of plain and venous phase CT images were measured,and the image quality was evaluated.The equation between mAs of enhanced scan and noise of plain scan image was derived.Another 100 continuous patients underwent liver enhanced CT scan (group B).Enhanced scan mAs was calculated from noise on plain scan by using the equation above.Noises on venous phase images were measured and the image quality was measured.Based on body mass index (BMI),patients in groups A and B were divided into three subgroups respectively:BMI ＜ 18.5 kg/m2,18.5 kg/m2 ≤ BMI ＜ 25.0 kg/m2 and BMI ≥ 25.0 kg/m2.Image quality score was compared with nonparametric rank sum test,CT dose index (CTDI) and effective dose (ED) were measured and compared between each subgroup with 2 independent samples t or t' test.Results The equation between enhanced scan mAs (mAsX) and plain scan noise (SDp) was as follows:mAsX =mAs1 × [(0.989 × SDp + 1.06) /SDx]2,mAs1 =250 mAs,SDx =13.In patients with BMI ＜ 18.5 kg/m2,ED of group A [(6.86 ±0.38) mSv,n =12] was significantly higher than group B [(2.66 ±0.46) mSv,n =10)] (t =18.52,P ＜0.01).In patients with 18.5 kg/m2 ≤ BMI ＜ 25.0 kg/m2,ED of group A [(7.08 ± 0.91) mSy,n =66] was significantly higher than group B [(4.50 ± 1.41) mSv,n =73] (t' =10.57,P ＜ 0.01).In patients with BMI ≥25.0 kg/m2,there was no significant difference between EDs of group A (7.54 ± 0.62 mSv,n =22) and group B [(8.19 ±3.16) mSv,n =17] (t' =0.89,P =0.39).Image quality of 5 patients in group A and none in group B did not meet the diagnostic requirement.Conclusion Setting mAs of enhanced scan according to plain scan noise could reduce the radiation dose with maintainence of image quality.